Wandering Fumarole + Crackdown Construct is another infinite combo. Much less of an instant win than the other one because it needs a single creature without evasion to connect... but still. Playtesting for this set must have been pretty awful.
Edit: And since Fumarole is a land, it doesn't even cost a slot. You could just throw a Construct into any red/blue deck as an occasional free win. Nuts.
You could play Fumarole and Crackdown Construct in the Saheeli combo deck if you wanted.